If a fat person were to go on a flying car, it will just be at the ground. When they exit, it will just fly up.
Flying Car Weight Limit
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Explanation
Explain Bear
Listen up, butterball. The joke is that a fat person weighs so darn much that a flying car can't even take off with them in it. And as soon as they waddle their way out, that car shoots up into the sky like it's been waiting its whole life for a diet. I bet you're so fat that your shadow has a shadow.